Oil-circulatory lubricating system.



P. DAIMLER & A. HEESS. OIL CIRGULATORY LUBRIGATING SYSTEM.

APPLICATION FILED MAYIO, 1913.

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V OIL OIEGULATORY LUBRIGATING SYSTEM,

APPLICATION FILED MAY 10, 1913. 1,090,518, I Patented Mar. 17,1914.

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P. DAIMLER & A. HEESS.

OIL GIRGULATORY LUBRIGATING SYSTEM. APPLICATION FILED MAY 10, 1913.

1,090,518. Q I Patented Mar. 17, 1914.

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P. DAIMLER 5: A. HEESS.

OIL OIROULATORY LUBRIOATING SYSTEM.

- APPLICATION FILED MAY 10,- 1913.

1,090,518, Patented Mar. 17,1914.

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OIL OIROULATOEY LUBRIGATING SYSTEM.

APPLICATION FILED MAY 10, 1913. 1,090,5 1 8. Patented Mar. 17, 1914.

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PAUL DAIMLER AND ALBERT HEESS, OF CANNSTATT, GERMANY, ASSIGNORS TO THE FIRIVI OF DAIMLER-MOTOREN-GESELLSCHAFT, OF UNTERTI TRKHEIM, GERIVIA'NY.

OIL-CIRCULATORY LUBRICATING SYSTEM.

Specification of Letters Patent;

Patented Mar. 117, 191%.

Application filed May 10, 1913. Serial No. 766,833.

To all whom it may concern Be it known that we, PAUL DAIMLER and ALBERT Hnnss, subjects of the King of Vurttemberg, residing at 87 vVaiblingerstrasse and 6S Daimlerstrasse, Cannstatt, Kingdom of lVurttemberg, Germany, respectively, have invented certainnew and useful Improvements in Oil-Circulatory Lubricating Systems, of which the following is a specification.

This invention relates to oil-circulatory lubricating systems for lubricating the various parts of motor road vehicles and the present invention comprises certain improvements in the oil-circulatory lubricating system described and claimed in the specification of the prior United States Patent No. 1,012,382, dated December 19, 1911, in which a main pump circulates oil to and from the parts to be lubricated while an auxiliary pump draws oil from a fresh oil supply and supplies the fresh oil to the oil circuit, the piston of the main pump simultaneously controlling communication between the auxiliary pump and the fresh oil supply and between the auxiliary pump and the oil circuit.

In the aforesaid prior patent specification the auxiliary or fresh oil pump is connected with the main or circulating pump by means of two passages serving for the supply of fresh oil to and from the fresh oil pump respectively.

The present invention has for its object to simplify the aforesaid arrangement and for this purpose the fresh oil pump is connected with the circulating pump by means of a single passage, while the piston of the main or circulating pump which simultaneously controls said passage is provided with two oil passages so arranged that on the suction stroke of the piston of the fresh oil pump the passage connecting the two pumps is put into communication with the fresh oil supply, while on the pressure stroke of the fresh oil piston the passage connecting the pumps is put into connection with the oil circuit through the cylinder of the circulating pump.

In order that the invention may be more clearly understood reference is made to the accompanying drawings whereon two em: bodiments of our invention are illustrated by way of example.

Figure 1 illustrates one form of our invention in vertical section on the line a-b of Fig. 2. Fig. 2 is a vertical section on the llne ccZ of Fig. 1. Figs. 36 are diagrams illustrating'the several positions of the lubricating system. Fig. 7 is a view corresponding to Fig 1 showing a slightly modified construction thereof.

The system comprises three pistons a, b and 0 working in corresponding barrels or cylinders Z, 711', m respectively and driven from eccentrics n, o, 72 on a driving shaft r mounted in suitable hearings in the upper part of the casing r of the pump mechanism.

The piston a constitutes the piston of the fresh oil pump, while the piston b constitutes a piston valve therefor and simulta neously constitutes the working piston of the circulating pump. The piston c is merely a piston valve controlling the circulating pump. The piston valve 0 is prc vided in a manner similar to the aforesaid prior patent specification with a reduced portion or neck 0.

The casing 1" of the pump mechanism is attached to the lower part of the motor casing s so that the oil returning from the lubricated parts collects in the lower part t of the casing 1 and can be supplied to the cylinder 7c of the circulating pump through theport f. The oil drawn into the cylinder 72 through the port f is again forced to the parts to be lubricated mixed with a certain amount of fresh oil by the piston I) through the port f and cylinder m to the port 9 to which the lubricating oil pipes are connected.

The cylinder 7c is in communication by way of a port it with the cylinder or barrel Z of the fresh oil pump and the piston b is provided with oil passages (Z and 2' adapted in different positions of the piston a to connect the port 72. with the fresh oil supply pipe 6 and with the cylinder 70 of the circulating pump respectively.

The operation of the lubricating device may be readily understood by reference to Figs. 3-6 of the drawings. When the several pistons a. Z) and c are in the position illustrated in Fig. 3 the piston b of the circulating pump moves downwardly, while the pistons 06 and o are raised. During the downward movement of the piston Z) its passage d uncovers the port it which connects the cylinder Z of the fresh oil pump with the cylinder 7:; of the circulating pump and simultaneously uncovers the fresh oil supply pipe 6 opening into the cylinder is so that on the subsequent lifting of the piston a fresh oil will be drawn into the cylinder Z from the fresh oil supply pipe 6 through the passages J and h. At the same time the piston Z; of the circulating pump forces the oil below it through the port 9 into the lubricating pipes, the piston valve 0 uncovering the port f connecting the cylinders 7c and m by means of its reduced portion 0 during this downward movement.

In the position illustrated in Fig. 4c the several pistons move upwardly, the piston a drawing in fresh oil through the passages e, (Z and it. By reason of the upward movement of the piston b the connection between the port h and the fresh oil supply pipe 6 will be gradually cut ofi and, as soon as the lower end of the piston valve 0 uncovers the port f, oil will be drawn into the cylinder Zn from the circulating oil collecting chamber On the parts attaining or slightly exceeding the position illustrated in Fig. 5, when the pistons a, and c commence their downward movement, while the piston b continues its upward movement, the latter will connect the cylinder Z and port 72, with the cylinder 70 by way of the passage 2' in the piston b. As the piston a is now moving downwardly, the fresh oil in the cylinder Z will be forced through the port it and passage Z into the cylinder is, while the piston 6 simultaneously draws oil from the circuit through the port f into the cylinder is.

In the position illustrated in Fig. 6 the several pistons move downwardly, the piston a continuing the supply of fresh oil through the port it and passage 71 to the cylinder is, while the piston valve 0 in its downward movement uncovers the port f, whereupon the downwardly moving piston b forces the oil from the oil circuit together with the fresh oil in the cylinder is through the opening f and cylinder m to the port 9 and from thence to the parts to be lubricated.

In the modification illustrated in Fig. 7 the operation is similar to that already described with reference to Figs. 16. In this case, however, the port it which connects the cylinder Z with the cylinder is is not arranged at the lower end of the cylinder Z, but is arranged in a position intermediate the cylinder Z and an extension Z thereof which receives a reduced extension (4 of the piston a, so that in this case the face of the pump a is annular.

\Ve claim 1. An oil-circulatory lubricating system comprising a main pump cylinder having a fresh oil inlet port therein, an auxiliary pump cylinder, a single port connecting said cylinders, a piston in said main cylinder adapted to control communication between said single port and main cylinder and between said single port and said fresh oil inlet port and a piston in said auxiliary cylinder.

2. An oil-circulatory lubricating system comprising a main pump cylinder, having a fresh oil inlet port therein, an auxiliary pump cylinder connected to said main cylinder through a single port, a piston in said main cylinder having two oil passages adapted to alternately establish communication between said ports and between said single port and the main cylinder, and a piston in said auxiliary cylinder.

3. An oil-circulatory lubricating system comprising a main pump cylinder, having a fresh oil inlet port therein, an auxiliary pump cylinder connected to said main cylinder through a single port, a piston in said main cylinder, a circumferential horizontal oil passage in said piston adapted to simultaneously register with said ports, a vertical oil passage adapted to periodically establish communication between said single port and the main cylinder and a piston in said auxiliary cylinder.

In witness whereof we have hereunto set our hands in the presence of two witnesses.

PAUL DAIMLER. ALBERT HEESS.

l/Vitnesses ROBERT UI-ILAND, ERNEST ENTENMANN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

